rbx register instead of rbp - Applications will read the wrong memory block instead of the parameter value.

[bryancall]

I ran this program over our API across versions and I am seeing these error show up for a few or our APIs. Here is a link to the report:
https://trafficserver.apache.org/compat_reports/traffic_server/9.0.x_to_9.1.x/compat_report.html#Symbol_Binary_Problems_High

I was able to git rid of the rpb errors by compiling our binary with -fno-omit-frame-pointer, but I was still seeing issues about the rbx register. Our API C code is statically linked into the server's binary to give some context.

Is this really an issue, sounds like it is, and if so is there a way I could fix this problem?

[bryancall]

Changing the API C code to be included into a .so I am seeing the error change from:
The parameter mutexp became passed in rbx register instead of rbp.
to:
The parameter mutexp became passed in rbx register instead of r12.